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Symfony\Component\HttpKernel\HttpCache

AbstractSurrogate	Abstract class implementing Surrogate capabilities to Request and Response instances.
Esi	Esi implements the ESI capabilities to Request and Response instances.
HttpCache	Cache provides HTTP caching.
ResponseCacheStrategy	ResponseCacheStrategy knows how to compute the Response cache HTTP header based on the different response cache headers.
Ssi	Ssi implements the SSI capabilities to Request and Response instances.
Store	Store implements all the logic for storing cache metadata (Request and Response headers).
SubRequestHandler

ResponseCacheStrategyInterface	ResponseCacheStrategyInterface implementations know how to compute the Response cache HTTP header based on the different response cache headers.
StoreInterface	Interface implemented by HTTP cache stores.
SurrogateInterface